Support GPT-5

[NolanTrem]

Closes #2241

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Important

Add support for GPT-5 by updating model handling and configuration files, and updating dependencies.

• Behavior:
  • Add support for gpt-5 in _get_base_args() in openai.py by adjusting token handling logic.
  • Update fast_llm, quality_llm, and vlm to gpt-5 models in r2r.toml.
• Dependencies:
  • Update openai dependency to >=1.99.0 in pyproject.toml.
• Versioning:
  • Bump version to 3.6.6 in pyproject.toml.

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Important

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1. py/core/providers/llm/openai.py:402

• Draft comment:
  Include 'gpt-5' in the model check to use 'max_completion_tokens'. Ensure that omitting temperature and top_p for these models is intentional.
• Reason this comment was not posted:
  Comment looked like it was already resolved.

2. pyproject.toml:20

• Draft comment:
  Bump OpenAI dependency to >=1.99.0 to support GPT-5. Confirm this upgrade is compatible with all usages.
• Reason this comment was not posted:
  Comment was not on a location in the diff, so it can't be submitted as a review comment.

3. r2r/r2r.toml:12

• Draft comment:
  Update LLM configurations for fast, quality, and vision models to GPT-5 variants. Ensure these new model strings are fully supported.
• Reason this comment was not posted:
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1. py/core/providers/llm/openai.py:402

• Draft comment:
  Formatting improvement: The multi-line generator expression is clearer. Confirm that checking for substrings 'o1', 'o3', and 'gpt-5' properly captures all GPT-5 variations (e.g., gpt-5-mini).
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